<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>Document</title>
    <script src="../../../vue.js"></script>
  </head>

  <body>
    <div id="app">
      <App></App>
    </div>
    <script>
      Vue.config.productionTip = false;

      const Header = Vue.extend({
        name: "Header",
        template: `
          <h2>我是头部header</h2>
        `,
      });

      const App = Vue.extend({
        name: "APP",
        components: {
          Header,
        },
        template: `
          <div>
            <h1>App {{message}}</h1>
            <Header></Header>  
          </div>
        `,
        data() {
          return {
            message: "hello",
          };
        },
      });

      console.log(App, "App"); //VueComponent构造函数

      const vm = new Vue({
        el: "#app",
        components: {
          App,
        },
        data() {
          return {};
        },
      });
    </script>
  </body>
</html>
